Six people were killed when a Piper airplane crashed on the TPC Scottsdale golf course. Eliott Simpson, an aviation accident investigator with the NTSB, speaks about the crash on April 10, 2018. Tom Tingle/azcentral.com

Police vehicles and yellow tape surround the site of a small-plane crash near the second hole of the Champions course at TPC Scottsdale, April 10, 2018. The plane crashed Monday night, killing all of those aboard.(Photo: Tom Tingle/The Republic)

Despite postings on social media, the identities of those killed in the Monday night crash have not been officially released, pending family notification. Officials did not have a timeline for when their names would be formally announced, Scottsdale police said in a statement.

Elliott said investigators were still working to determine who was on the Las Vegas-bound plane when it departed from Runway 3 at about 8:45 p.m. They're also looking into the pilot and his qualifications.

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A small plane makes its final approach to Scottsdale Airport, April 10, 2018. Police vehicles and yellow tape below surround the site of a Piper Comanche that crashed near the second hole of the Champions course at TPC Scottsdale Monday night, killing all six on board. Tom Tingle/The Republic

Police vehicles and yellow tape surround the site of a small-plane crash near the second hole of the Champions course at TPC Scottsdale, April 10, 2018. The plane crashed Monday night, killing all of those aboard. Tom Tingle/The Republic

Police vehicles and yellow tape surround the site of a small-plane crash near the second hole of the Champions course at TPC Scottsdale, April 10, 2018. The plane crashed Monday night, killing all of those aboard. Tom Tingle/The Republic

Police vehicles and yellow tape surround the site of a small-plane crash near the second hole of the Champions course at TPC Scottsdale, April 10, 2018. The plane crashed Monday night, killing all of those aboard. Tom Tingle/The Republic

Police vehicles and yellow tape surround the site of a small-plane crash near the second hole of the Champions course at TPC Scottsdale, April 10, 2018. The plane crashed Monday night, killing all of those aboard. Tom Tingle/The Republic

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The aircraft was built in 1970, according to FAA records. Though listed as a four-seater, Elliott said there were various iterations and modifications that could have been made that year, expanding its seating capacity.

Even though the plane was registered in Las Vegas, the official registration was not deemed fit because it was terminated or in question, possibly because of a paperwork or technical issue, according to FAA records.

For reasons investigators had not yet determined, the plane crashed about 3/4 of a mile away, and 30 degrees to the left of, the runway it took off from.

It then burst into flames.

Aerial footage taken Tuesday morning showed the charred remnants of the plane, which crash-landed in an area next to the green at hole two on the Champions Golf Course at TPC Scottsdale.

The NTSB is leading the investigation.

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Debbie Robinson, a resident of Scottsdale who lives near the TPC Scottsdale golf course, heard the impact of the small plane that crashed into the Champions Course on April 9, 2018, and ran out to see what happened. Tom Tingle/azcentral.com

Elliott said crews were working to collect perishable evidence from the scene Tuesday. The wreckage will then be transported to a site in Phoenix for further evaluation.

A preliminary report is expected in 10 to 14 days. A factual report outlining in detail what occurred could take up to 18 months, as is typical in aviation investigations.

The FAA will also assist in the investigation, according to Allen Kenitzer, a spokesman at the agency.

The Champions course was closed Tuesday for the investigation, but the TPC Stadium Course, where the popular annual Waste Management Phoenix Open is held, was open for play, TPC administrator Taylor Farley said.